Colored Stem

Colored Stem.markdown

Colored Stem

Watch the stem change color to reflect the post type as you scroll down the page. It's quite nice.

A Pen by Nicklas Sandell on CodePen.

License.

index.html

<div class="stem-wrapper">
	<div class="stem"></div>
	<div class="stem-background"></div>
</div>

<header class="section header">
	<div class="section-inner">
		
		<div class="master-head">
			<h1 class="page-title">Colored Stem</h1>
			<p class="page-description">Your bones don't break, mine do. That's clear. Your cells react to bacteria and viruses differently than mine. You don't get sick, I do. That's also clear. But for some reason, you and I react the exact same way to water.</p>
			<p class="scroll-button" onClick="$('.post-wrapper .post:first-child .stem-overlay .icon').click();">Ready to go for a ride?</p>
		</div>
			
	</div> <!-- section-inner -->
</header> <!-- header -->

<div class="section main-content">
	<div class="section-inner">
	
		<div class="stem-padding"></div>
		
		<div class="post-wrapper">
			
			<article class="post bitbucket-icon">
				<div class="stem-overlay">
					<div class="icon"></div>
					<div class="stem-mask"></div>
				</div>
				
				<div class="post-content">
					<p class="meta">Written yesterday at 8:56 pm</p>
					<h2 class="post-title">This is my post title</h2>
					<div class="entry-content">
						<p>Your bones don't break, mine do. That's clear. Your cells react to bacteria and viruses differently than mine. You don't get sick, I do. That's also clear. But for some reason, you and I react the exact same way to water. We swallow it too fast, we choke. We get some in our lungs, we drown. However unreal it may seem, we are connected, you and I. We're on the same curve, just on opposite ends.</p>
					</div>
				</div>
			</article>
		
			<article class="post m-icon" data-stem-color="green">
				<div class="stem-overlay">
					<div class="icon"></div>
					<div class="stem-mask"></div>
				</div>
				
				<div class="post-content">
					<p class="meta">Written yesterday at 8:56 pm</p>
					<h2 class="post-title">This is my post title</h2>
					<div class="entry-content">
						<p>Your bones don't break, mine do. That's clear. Your cells react to bacteria and viruses differently than mine. You don't get sick, I do. That's also clear. But for some reason, you and I react the exact same way to water. We swallow it too fast, we choke. We get some in our lungs, we drown. However unreal it may seem, we are connected, you and I. We're on the same curve, just on opposite ends.</p>
					</div>
				</div>
			</article>
		
			<article class="post music-icon" data-stem-color="yellow">
				<div class="stem-overlay">
					<div class="icon"></div>
					<div class="stem-mask"></div>
				</div>
				
				<div class="post-content">
					<p class="meta">Written yesterday at 8:56 pm</p>
					<h2 class="post-title">This is my post title</h2>
					<div class="entry-content">
						<p>Your bones don't break, mine do. That's clear. Your cells react to bacteria and viruses differently than mine. You don't get sick, I do. That's also clear. But for some reason, you and I react the exact same way to water. We swallow it too fast, we choke. We get some in our lungs, we drown. However unreal it may seem, we are connected, you and I. We're on the same curve, just on opposite ends.</p>
					</div>
				</div>
			</article>
		
			<article class="post twitter-icon" data-stem-color="white">
				<div class="stem-overlay">
					<div class="icon"></div>
					<div class="stem-mask"></div>
				</div>
				
				<div class="post-content">
					<p class="meta">Written yesterday at 8:56 pm</p>
					<h2 class="post-title">This is my post title</h2>
					<div class="entry-content">
						<p>Your bones don't break, mine do. That's clear. Your cells react to bacteria and viruses differently than mine. You don't get sick, I do. That's also clear. But for some reason, you and I react the exact same way to water. We swallow it too fast, we choke. We get some in our lungs, we drown. However unreal it may seem, we are connected, you and I. We're on the same curve, just on opposite ends.</p>
					</div>
				</div>
			</article>
		
			<article class="post bitbucket-icon">
				<div class="stem-overlay">
					<div class="icon"></div>
					<div class="stem-mask"></div>
				</div>
				
				<div class="post-content">
					<p class="meta">Written yesterday at 8:56 pm</p>
					<h2 class="post-title">This is my post title</h2>
					<div class="entry-content">
						<p>Your bones don't break, mine do. That's clear. Your cells react to bacteria and viruses differently than mine. You don't get sick, I do. That's also clear. But for some reason, you and I react the exact same way to water. We swallow it too fast, we choke. We get some in our lungs, we drown. However unreal it may seem, we are connected, you and I. We're on the same curve, just on opposite ends.</p>
					</div>
				</div>
			</article>
		
			<article class="post music-icon" data-stem-color="yellow">
				<div class="stem-overlay">
					<div class="icon"></div>
					<div class="stem-mask"></div>
				</div>
				
				<div class="post-content">
					<p class="meta">Written yesterday at 8:56 pm</p>
					<h2 class="post-title">This is my post title</h2>
					<div class="entry-content">
						<p>Your bones don't break, mine do. That's clear. Your cells react to bacteria and viruses differently than mine. You don't get sick, I do. That's also clear. But for some reason, you and I react the exact same way to water. We swallow it too fast, we choke. We get some in our lungs, we drown. However unreal it may seem, we are connected, you and I. We're on the same curve, just on opposite ends.</p>
					</div>
				</div>
			</article>
			<article class="post bitbucket-icon">
				<div class="stem-overlay">
					<div class="icon"></div>
					<div class="stem-mask"></div>
				</div>
				
				<div class="post-content">
					<p class="meta">Written yesterday at 8:56 pm</p>
					<h2 class="post-title">This is my post title</h2>
					<div class="entry-content">
						<p>Your bones don't break, mine do. That's clear. Your cells react to bacteria and viruses differently than mine. You don't get sick, I do. That's also clear. But for some reason, you and I react the exact same way to water. We swallow it too fast, we choke. We get some in our lungs, we drown. However unreal it may seem, we are connected, you and I. We're on the same curve, just on opposite ends.</p>
					</div>
				</div>
			</article>
		
			<article class="post m-icon" data-stem-color="green">
				<div class="stem-overlay">
					<div class="icon"></div>
					<div class="stem-mask"></div>
				</div>
				
				<div class="post-content">
					<p class="meta">Written yesterday at 8:56 pm</p>
					<h2 class="post-title">This is my post title</h2>
					<div class="entry-content">
						<p>Your bones don't break, mine do. That's clear. Your cells react to bacteria and viruses differently than mine. You don't get sick, I do. That's also clear. But for some reason, you and I react the exact same way to water. We swallow it too fast, we choke. We get some in our lungs, we drown. However unreal it may seem, we are connected, you and I. We're on the same curve, just on opposite ends.</p>
					</div>
				</div>
			</article>
		
			<article class="post music-icon" data-stem-color="yellow">
				<div class="stem-overlay">
					<div class="icon"></div>
					<div class="stem-mask"></div>
				</div>
				
				<div class="post-content">
					<p class="meta">Written yesterday at 8:56 pm</p>
					<h2 class="post-title">This is my post title</h2>
					<div class="entry-content">
						<p>Your bones don't break, mine do. That's clear. Your cells react to bacteria and viruses differently than mine. You don't get sick, I do. That's also clear. But for some reason, you and I react the exact same way to water. We swallow it too fast, we choke. We get some in our lungs, we drown. However unreal it may seem, we are connected, you and I. We're on the same curve, just on opposite ends.</p>
					</div>
				</div>
			</article>
		
			<article class="post twitter-icon" data-stem-color="white">
				<div class="stem-overlay">
					<div class="icon"></div>
					<div class="stem-mask"></div>
				</div>
				
				<div class="post-content">
					<p class="meta">Written yesterday at 8:56 pm</p>
					<h2 class="post-title">This is my post title</h2>
					<div class="entry-content">
						<p>Your bones don't break, mine do. That's clear. Your cells react to bacteria and viruses differently than mine. You don't get sick, I do. That's also clear. But for some reason, you and I react the exact same way to water. We swallow it too fast, we choke. We get some in our lungs, we drown. However unreal it may seem, we are connected, you and I. We're on the same curve, just on opposite ends.</p>
					</div>
				</div>
			</article>
		
			<article class="post bitbucket-icon">
				<div class="stem-overlay">
					<div class="icon"></div>
					<div class="stem-mask"></div>
				</div>
				
				<div class="post-content">
					<p class="meta">Written yesterday at 8:56 pm</p>
					<h2 class="post-title">This is my post title</h2>
					<div class="entry-content">
						<p>Your bones don't break, mine do. That's clear. Your cells react to bacteria and viruses differently than mine. You don't get sick, I do. That's also clear. But for some reason, you and I react the exact same way to water. We swallow it too fast, we choke. We get some in our lungs, we drown. However unreal it may seem, we are connected, you and I. We're on the same curve, just on opposite ends.</p>
					</div>
				</div>
			</article>
		
			<article class="post music-icon" data-stem-color="yellow">
				<div class="stem-overlay">
					<div class="icon"></div>
					<div class="stem-mask"></div>
				</div>
				
				<div class="post-content">
					<p class="meta">Written yesterday at 8:56 pm</p>
					<h2 class="post-title">This is my post title</h2>
					<div class="entry-content">
						<p>Your bones don't break, mine do. That's clear. Your cells react to bacteria and viruses differently than mine. You don't get sick, I do. That's also clear. But for some reason, you and I react the exact same way to water. We swallow it too fast, we choke. We get some in our lungs, we drown. However unreal it may seem, we are connected, you and I. We're on the same curve, just on opposite ends.</p>
					</div>
				</div>
			</article>
		</div> <!-- post-wrapper -->
	
		<div class="single-stem-icon scroll-to-top trigger-scroll-to-top"></div>
			
	</div> <!-- section-inner -->
</div> <!-- main-content -->
	
<footer class="footer section">
	<div class="section-inner">
		
		<div class="good-bye">
			<p>That's all, buddy!</p>
       <p>Psst. You can click the icons to scroll to each post. Click the last one to scroll back up.</p>
		
	</div> <!-- section-inner -->
</footer> <!-- footer -->

script.js

(function($) {

	$(document).ready(function() {
		setupFade();
		setupClickToScroll();
		setupPostAnimation();
		setupScrollToTop();
     enableScrollAbortion();

		// Trigger window.scroll, this will initiate some of the scripts
		$(window).scroll();
  });
  
  
  // Allow user to cancel scroll animation by manually scrolling
  function enableScrollAbortion() {
    var $viewport = $('html, body');
    $viewport.on('scroll mousedown DOMMouseScroll mousewheel keyup', function(e) {
        if ( e.which > 0 || e.type === 'mousedown' || e.type === 'mousewheel') {
             $viewport.stop();
        }
    });
  }

	function setupScrollToTop() {
		var scrollSpeed = 750;
		$('.trigger-scroll-to-top').click(function(e) {
			e.preventDefault();
			$('html, body').animate({
				scrollTop: 0
			}, scrollSpeed);
		});
	}


	function setupPostAnimation() {
		var posts = $('.post-wrapper .post');
		$(window).on('scroll resize', function() {

			var currScroll = $(window).scrollTop() > $(document).scrollTop() ? $(window).scrollTop() : $(document).scrollTop(),
				windowHeight = $(window).height(), // Needs to be here because window can resize
				overScroll = Math.ceil(windowHeight*.20),
				treshhold = (currScroll + windowHeight) - overScroll;

			posts.each(function() {

				var post = $(this),
					postScroll = post.offset().top

				if(postScroll > treshhold) {
					post.addClass('hidden');
				} else {
					post.removeClass('hidden');
				}

			});

		});
	}

	function setupFade() {

		var posts = $('.post-wrapper .post').reverse(),
			stemWrapper = $('.stem-wrapper'),
			halfScreen = $(window).height() / 2;

		$(window).on('scroll resize', function() {

			delay(function() {

				var currScroll = $(window).scrollTop() > $(document).scrollTop() ? $(window).scrollTop() : $(document).scrollTop(),
					scrollSplit = currScroll + halfScreen;

				posts.removeClass('active').each(function() {

					var post = $(this),
						postOffset = post.offset().top;

					if(scrollSplit > postOffset) {

						// Add active class to fade in
						post.addClass('active')

						// Get post color
						var color = post.data('stem-color') ? post.data('stem-color') : null,
							allColors = 'color-green color-yellow color-white'

						stemWrapper.removeClass(allColors);

						if(color !== null) {
							stemWrapper.addClass('color-' + color);
						}

						return false;
					}

				});
			}, 20);

		});

	}


	function setupClickToScroll(post) {

		var scrollSpeed = 750;

		$('.post-wrapper .post .stem-overlay .icon').click(function(e) {
			e.preventDefault();

			var icon = $(this),
				post = icon.closest('.post'),
				postTopOffset = post.offset().top,
				postHeight = post.height(),
				halfScreen = $(window).height() / 2,
				scrollTo = postTopOffset - halfScreen + (postHeight/2);

			$('html, body').animate({
				scrollTop: scrollTo
			}, scrollSpeed);
		});

	}

})(jQuery);




/*==========  Helpers  ==========*/


// Timeout function
var delay = (function(){
	var timer = 0;
	return function(callback, ms){
		clearTimeout (timer);
		timer = setTimeout(callback, ms);
	};
})();

$.fn.reverse = function() {
    return this.pushStack(this.get().reverse(), arguments);
};

scripts

<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/selectivizr/1.0.2/selectivizr-min.js"></script>

style.less

@import "lesshat";



/*==========  Global  ==========*/


@centered-content-width: 1024px;



/*==========  Basics  ==========*/

@body-background: #112C30;

html, body {
	height: 100%;
}
body {
	background: @body-background;
	margin: 0px;
	padding: 0px;
	font-family: sans-serif;
	font-size: 15px;
	line-height: 26px;
	color: #B9CFD0;
	font-family: 'Roboto Slab', serif;
	overflow-x: hidden;
	overflow-y: scroll;
}

a {
	color: #B9CFD0;
	text-decoration: none;
	border-bottom: 1px solid #B9CFD0;
}

h1, h2, h3, h4, h5, h6 {
	font-family: 'Comfortaa', cursive;
}


/*==========  Sections  ==========*/

@header-background: #39ACBD;
.header {
	text-align: center;
	position: relative;
	z-index: 1;
  background-image: linear-gradient(to bottom, lighten(@header-background, 15%) 0%, @header-background 100%);


	.master-head {
		padding: 7% 30px;
	}

	.page-title {
		padding: 0 30px 0 30px;
		font-size: 60px;
		line-height: 1em;
		letter-spacing: 10px;
		color: #FFF;
	}

	.page-description {
		margin: 30px auto;
		max-width: 600px;
		font-size: 18px;
		line-height: 2em;
		color: #FFF;
	}

	.scroll-button {
		color: #FFF;
		font-size: 20px;
		padding: 15px 20px 15px 20px;
		display: inline-block;
		background: #3093A2; // rgba(0,0,0,.14)
		cursor: pointer;
		.transition-duration(.4s);
		.user-select(none);

		&:hover {
			background: darken(#3093A2, 10%);
		}
		&:active {
			background: darken(#3093A2, 20%);
		}
	}
}

.main-content {
	margin: 0px auto;
	position: relative;

	.section-inner, .post-wrapper {
		.clearfix;
	}
}

.footer {
	background: @body-background;
	padding: 150px 0px 300px 0px;
	position: relative;
	z-index: 1;

	.good-bye {
		text-align: center;
		font-size: 18px;
		line-height: 36px;

		p {
			display: block;
			margin: 0px auto 30px auto;
			max-width: 300px;
			clear: both;
		}
	}
}


.section {
	.section-inner {
		margin: 0px auto;
		width: @centered-content-width;

		@media only screen {
			width: auto;
			max-width: @centered-content-width;
		}
	}
}






/*==========  Stem  ==========*/

@stem-width: 60px;
@stem-default-glow: @header-background;
.stem-wrapper {
	position: fixed;
	top: 0px;
	bottom: 0px;
	left: 50%;

	&.color-yellow .stem-background {
		background: #E9E566;
	}
	&.color-green .stem-background {
		background: #35C189;
	}
	&.color-white .stem-background {
		background: #FFF;
	}

	.stem, .stem-background {
		position: absolute;
		top: 0px; left: -(@stem-width / 2);
		width: @stem-width;
	}
	.stem {
		background: lighten(@body-background, 10%);
		height: 100%;
	}
	.stem-background {
		background: @stem-default-glow;
		height: 50%;
		.transition-duration(.5s);
	}
}


.stem-padding, .single-stem-icon {
	width: @stem-width;
	height: @stem-width; // Override with inline styling
	margin: 0px auto;
	background: transparent url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/22043/stem-mask.png) repeat-y top center;
}

.single-stem-icon.scroll-to-top {
	cursor: pointer;
	background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/22043/scroll-to-top-icon.png);
}




/*==========  Post wrapper ==========*/

.post-wrapper {

	@post-stem-padding: 80px;
	@post-width: (@centered-content-width/2) - @post-stem-padding;

	.clearfix;

	.post {
		position: relative;
		width: @post-width;
		padding: 0px 0px 60px 0px;
		clear: both;
		opacity: 1;
		.perspective(1000px);

		&.hidden .post-content {
			.transform(translateY(100px) rotateX(30deg));
			opacity: 0;
		}

		&:hover .post-content, &.active .post-content {
			opacity: 1;
			.meta {
				opacity: 1;
				.transform(none);
			}
		}

		&:nth-child(even) {
			float: right;
		}
		&:nth-child(odd) {
			float: left;
		}




		&:nth-child(even) .stem-overlay {
			left: -110px;
		}
		&:nth-child(odd) .stem-overlay {
			right: -110px;
		}


		&.music-icon .stem-overlay .icon {
			background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/22043/music-icon.png);
		}
		&.bitbucket-icon .stem-overlay .icon {
			background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/22043/bitbucket-icon.png);
		}
		&.m-icon .stem-overlay .icon {
			background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/22043/m-icon.png);
		}
		&.twitter-icon .stem-overlay .icon {
			background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/22043/twitter-icon.png);
		}

		.stem-overlay {
			position: absolute;
			top: 0px;
			bottom: 0px;
			width: @stem-width;

			.icon {
				background: transparent no-repeat center center;
				height: @stem-width;
				width: @stem-width;
				cursor: pointer;
			}

			.stem-mask {
				position: absolute;
				top: @stem-width;
				bottom: 0px;
				left: 0px;
				right: 0px;
				background: transparent url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/22043/stem-mask.png) repeat-y top center;
			}
		}





		.post-content {
			opacity: .3;
			.transition-duration(.4s);
			.transform(none);

			.meta {
				color: rgba(255,255,255,.3);
				margin: 0px 0px 15px 0px;
				letter-spacing: 1px;
				opacity: 0;
				.transition-duration(1s);
				.transition-delay(.2s);
				.transform(translateY(-5px))
			}

			.post-title {
				font-size: 32px;
				line-height: 42px;
				margin: 0px 0px 15px 0px;
			}
		}
	}

}








/*==========  Media queries  ==========*/

@media only screen and (max-width: 1080px) {


	.main-content {
		&, .section-inner {
			max-width: none;
		}
	}



	.stem-wrapper {
		left: 80px;
	}

	.stem-padding, .single-stem-icon {
		margin: 0px;
		float: left;
		margin-left: 50px;
	}

	.post-wrapper .post {

		// To add extra weight to the selector
		&, &:nth-child(even), &:nth-child(odd) {
			width: auto;
			margin-left: 110px;
			float: none;

			.stem-overlay {
				left: -60px;
				right: auto;
			}
		}

		.post-content {
			padding: 0px 50px;
		}

	}

}

@media only screen and (max-width: 700px) {

	.header .page-title {
		font-size: 40px;
	}

	.post-wrapper .post {
		margin-left: 90px !important;

		.post-content {
			padding: 0 25px;
		}
	}

	.stem-wrapper {
		left: 60px;
	}

	.stem-padding, .single-stem-icon {
		margin-left: 30px;
	}

}









.clearfix {
    .clearfix_mixin;
}
// The micro clearfix http://nicolasgallagher.com/micro-clearfix-hack/
.clearfix_mixin() {
  *zoom:1;
  
  &:before,
  &:after {
      content:"";
      display:table;
  }
  &:after {
      clear:both;
  }
}

styles

<link href="http://fonts.googleapis.com/css?family=Roboto+Slab|Comfortaa" rel="stylesheet" />